On Wed, 2008-05-07 at 21:02 -0600, Diego Rivera wrote:
> Thanks for the quick answer, however, the GTK+ component is the same
> process as the Console application. The console application checks for
> some arguments and finishes by calling the working function of the
> application with parameters that reflect the arguments received from
> the console. My GtkButton callback just calls this last function with
> some parameters i have selected.
>
> So no inter-process communication is requiered
>
> Thanks for the suggestion anyway
>
OK, then you need to post some relevant portion of the code if possible.
These type of issues can be as casued by simple things like - using
local stack memory for structures vs malloc or g_new0() memory for them.
Post your main() and the callback for us to look at. And please do
consider the valgrind suggestion, or retry the gdb exercise.
James,
> -Diego--
>
> On Wed, May 7, 2008 at 8:55 PM, James Scott Jr <[EMAIL PROTECTED]>
> wrote:
>
>
>
> On Wed, 2008-05-07 at 20:33 -0600, Diego Rivera wrote:
> > Hi! I am not exactly new to GTK+, however I have come across
> a problem i
> > have no explanation for, and I'll be glad if someone could
> point me towards
> > a possible solution.
> >
> > I am currently developing an application that uses various
> algorithms for
> > sequence alignment in biological applications (DNA, RNA,
> Proteins and so
> > on). This application is mainly for scientific purposes.
> >
> > The core algorithms are already running fine as a console
> application in a
> > very stable version. I am working in adding some graphical
> interface to the
> > program using GTK+. So, I built a little Window that asks
> for the different
> > parameters and makes a call to the already defined functions
> in the console
> > application, which are indeed stable. However, when making
> the call to the
> > algorithm with GTK+ running, some of the pointers in my data
> structures get
> > lost, and I just get a Segmentation Fault.
> >
> > While trying to debug this weird behavior, I have narrowed
> the problem to
> > the fact of having a window running.
> >
> > Right now, I just have a main that creates a GtkWindow with
> a GtkButton, and
> > the callback of the button calls the stable routine of the
> console
> > application using some "hard-wired" parameters. I have made
> tests and the
> > console application gives the correct answer for those
> parameters. However,
> > when calling the routine from the callback, Segmentation
> Fault is the only
> > result I have been able to get.
> >
> > I have tried with different versions of GTK+ and the outcome
> is persistent.
> >
> > The data structure of the console application looks
> something like this:
> >
> > typedef struct{
> > int length;
> > char* seq;
> > }sequence_t;
> >
> > typedef struct{
> > int n;
> > int m;
> > int** table;
> > }table_t;
> >
> > typedef struct{
> > sequence_t* vp;
> > sequence_t* wp;
> > table_t* table;
> > int scoring;
> > int result;
> > }alignment_t;
> >
> > Using gdb i have found that the Segmentation Fault occurs at
> some point when
> > accesing the table from the alignment.
> >
> > I believe i have made no memory errors in my console
> application, since it
> > runs ok every time. However, i haven't seen the correct
> output from my GTK
> > application.
> >
> > Is there any hint that you could give me in order to correct
> the error?
> >
>
> How did you add the GTK component to the existing console app;
> are they
> one process or two?
>
> Your segfault suggest that they are two separate processes.
> In which
> case attempting to share memory elements will cause a segfault
> every
> time no matter how correct and hard-coded the structures.
>
> You may need to consider designing in and using some type of
> IPC
> (Inter-Process Communications) like a named-pipe,
> shared-memory, socket
> communications, memory queue, etc. Something designed to
> communicate
> between two active processes.
>
> James,
>
>
> > Thanks
> > - Diego Rivera -
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list@gnome.org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
>
>
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